I can't really add much more to what everyone else has said. But, are you dead set on a rifle scope? I have a 4-12x scope on my granddad's 300 Weatherby, and even at 12x power, I could clearly get a good sight picture of a whitetail while glassing them at 380 yards one morning. In my opinion, it was adequate magnification for that kind of shot. Burris makes a 3-12x pistol scope that would give you a decent amount of magnification while eliminating the issues posed by the short eye relief, which would give you more chambering options.